Rough Framing–Rough-in Vent Termination
SECTION 3
FRAMING
#CLW-50-MV
R.1 October 2021
16
HUSSONG MFG. CO., INC.
KOZY HEAT FIREPLACES
3.5.2 Rough-in Vent Termination
The following information applies to all standard, KZK, and vented
cavity installation options.
This is a cold air transfer area. The fireplace enclosure must comply
with all clearances as outlined in this manual, and be constructed
in compliance with local building codes. Outside walls should be
insulated to prevent cold air from entering room.
Exterior vent termination location must be in compliance with section
6.2, MINIMUM TERMINATION CLEARANCES
RECESS THE VENT CAP INTO WALL OR SIDING.
IMPORTANT - METAL FAB VENT SYSTEM:
When installing Metal Fab
vent pipe, an adapter must be used. This will increase the minimum
height for the center of the vent pipe by 3-1/4” (83mm) when framing
the wall pass through. The minimum enclosure depth will be increased
by 4” (101mm).
3.5.2.1 Clearances
•
A minimum of 1” (25mm) clearance on all sides of the vertical
vent pipe must be maintained.
•
A minimum of 3” (76mm) on the top of the horizontal pipe, and
1” (25mm) on the sides and bottom of the horizontal pipe at the
wall pass through must be maintained.
3.5.2.2 Vertical Terminations
Follow vent pipe manufacturer’s installation instructions for vertical
terminations.
•
Attic insulation shields may be insulated using unfaced
insulation products listed as non-combustible per ASTM E 136.
3.5.2.3 Horizontal Terminations
IMPORTANT: Horizontal vent sections require 1/4” (6mm) rise for every
12” (305mm) of travel.
•
Kozy Heat’s #800-WPT series, or wall thimble products
that comply with the required
3” (76mm) top clearance
to
combustibles, must be installed for all horizontal vent runs
that pass through interior or exterior walls. These wall thimble
products may be insulated using unfaced insulation products
listed as noncombustible per ASTM E 136. Refer to
for framing dimensions.
#800-WPT wall thickness covers 4½” (114mm) to 6½” (165mm).
#800-WPT2 wall thickness covers 6½” (165mm) to 12½” (318mm).
•
Elbows listed with approved vent systems for this appliance
vary in vertical length. Please consult the vent manufacturer’s
instructions to determine the elbow dimension used for
installation. Adjust the wall pass-through rough opening
dimensions to maintain clearance requirements.
Instructions continue on the next page.
12
½
”
(317mm)
5
¼
” (133mm)
10
7⁄8
”
(276mm)
#800-WPT and #800-WPT2 Rough-in Framing
(sold separately)
FIGURE 3.6
#800-WPT series
Nominal 2” x 4” framing used
